title: Expression of surface membrane IgG on pokeweed mitogen-reactive anti-tetanus toxoid antibody-producing cells.
abstract: Anti-tetanus toxoid antibody-producing cells, differentially expressing surface membrane IgM, were analyzed for the additional expression of surface membrane IgG. micron+ and micron- cells were rosetted with anti-gamma-ox red blood cells and separated by density centrifugation into fractions enriched or depleted of gamma + cells. These B-cell subsets were assayed for the production of IgM and IgG anti-tetanus toxoid antibody and total IgM and IgG. The results indicated that the majority of anti-tetanus toxoid antibody synthesis in the micron- fraction was by gamma + cells. In the microm+ fraction, however, both IgM and IgG anti-tetanus toxoid antibody production was detected in the micron+ gamma- and micron+ gamma+ fraction. The inclusion of isotype-specific antisera during the first 2 days of culture further established that gamma was expressed on the surface of the majority of the precursors for IgG anti-tetanus antibody production in vitro. Studies performed to determine the culture requirements of micron- and micron+ cells revealed that production of IgG anti-tetanus toxoid antibody by both cell subsets was dependent on T cells and pokeweed mitogen. However, some micron- cells could produce IgG in the presence of T cells alone.
mesh_terms: D000818:Animals; D000921:Antibody-Producing Cells / Q000145:classification / Q000166:cytology / Q000276:immunology*; D002417:Cattle; D002454:Cell Differentiation; D004306:Dose-Response Relationship, Immunologic; D006801:Humans; D007106:Immune Sera / Q000494:pharmacology; D007074:Immunoglobulin G / Q000096:biosynthesis / Q000276:immunology*; D007075:Immunoglobulin M / Q000096:biosynthesis; D007142:Immunoglobulin gamma-Chains; D007148:Immunoglobulin mu-Chains; D011043:Pokeweed Mitogens / Q000494:pharmacology; D011947:Receptors, Antigen, B-Cell / Q000276:immunology*; D012397:Rosette Formation; D013601:T-Lymphocytes / Q000276:immunology; D013745:Tetanus Toxoid / Q000276:immunology*
chemical_list: D007106:Immune Sera; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D007142:Immunoglobulin gamma-Chains; D007148:Immunoglobulin mu-Chains; D011043:Pokeweed Mitogens; D011947:Receptors, Antigen, B-Cell; D013745:Tetanus Toxoid